Ultrasonic velocity measurement device and velocity measurement method thereof

Abstract

The invention belongs to the technical field of ultrasonic flowdetection and provides an ultrasonic velocity measurement device and a velocity measurement method thereof. The ultrasonic velocity measurement device comprises a time digital conversion module, an ultrasonic transducer, a compensation adjustment module, a comparator, a shielding module and a pulse width detection module, wherein a starting signal is outputted to the ultrasonic transducer by the time digital conversion module; an ultrasonicsine wave signal is outputted to the shielding module by the ultrasonic transducer; a shielding window is arranged on the shielding module and is used for shielding the ultrasonicsine wave signal; the comparator is used for acquiring a square signal according to a compensating signal and the shielded ultrasonicsine wave signal, filtering the square signal and acquiring a first wave signal and a sequence square wave; the time digital conversion module is used for acquiring an ultrasonic propagation time difference according to the starting signal and the sequence square wave. The shielding module is arranged for shielding an interference signal in the received ultrasonic wave, so that the problems of mistaken time calculation and flow velocity calculation caused by the operation of mistakenly considering the interference signal as an ultrasonic echo signal can be avoided.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic flow detection, and in particular relates to an ultrasonic velocity measuring device and a velocity measuring method thereof. Background technique [0002] At present, in the known ultrasonic measurement chips, the comparators used for ultrasonic echo recognition use a fixed voltage compensation value. In ultrasonic detection, identifying the first wave is a very important step. If a fixed voltage compensation value is used, In the case of external interference, misjudgment is likely. When the compensation value is too low, some noise signals may not be filtered, and the noise signal may be misjudged as an ultrasonic signal. When the compensation value is too high, the square wave of the ultrasonic signal may be filtered out. The first wave, resulting in deviation of the measurement results. When the water quality is too poor or the sensor probe is polluted or covered, such as when the sensor ...

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Problems solved by technology

[0004] The ultrasonic speed measuring device and the speed measuring method provided by the embodiments of the present invention solve the defect in the prior art that there is an interference signal in the ultrasonic signal, which causes it to be mistaken for an ultrasonic echo signal, thereby generating wrong time calculation and flow velocity calculation

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